Universal Quantum-Copying Machines: A Sufficient And Necessary Condition

Elsevier Science Bv
Publication Type:
Journal Article
Physics Letters A, 2002, 302 (1), pp. 1 - 7
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It was shown that the copying quality of the Wootters-Zurek quantum copying machine depends on the input states. So Buzek and Hillery proposed the notion of universal copying machine. A universal machine is a quantum copier whose copying quality is indep
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